/**
 * @author chengliang
 * @date 2026/1/23 18:38
 * @brief
 *
 **/

package tool

import (
	"crypto/md5"
	"encoding/hex"
	"fmt"
	"hash"
	"sort"
	"strings"
	"sync"
)

const KEY_SECRET = "secret"

var md5Pool = sync.Pool{
	New: func() interface{} {
		return md5.New()
	},
}

func GenSign(params map[string]any) string {
	var keys []string
	for k := range params {
		keys = append(keys, k)
	}
	sort.Strings(keys)
	fmt.Println("keys:", keys)
	var paramParts []string
	for _, k := range keys {
		paramParts = append(paramParts, fmt.Sprintf("%s=%s", k, params[k]))
	}
	paramStr := strings.Join(paramParts, "&")
	paramStr = fmt.Sprintf("%s&%s", paramStr, KEY_SECRET)

	md5Obj := md5Pool.Get().(hash.Hash)
	defer md5Pool.Put(md5Obj)

	md5Obj.Reset()
	md5Obj.Write([]byte(paramStr))
	md5ObjSum := md5Obj.Sum(nil)

	return hex.EncodeToString(md5ObjSum)
}